//
//  KeyChain.m
//  ww
//
//  Created by 乔明超 on 16/11/11.
//  Copyright © 2016年 Goldencis. All rights reserved.
//

#import "KeyChain.h"

@implementation KeyChain
+ (NSMutableDictionary *)getKeychainQuery:(NSString *)service {
    return [NSMutableDictionary dictionaryWithObjectsAndKeys:
            (id)kSecClassGenericPassword,(id)kSecClass,
            service, (id)kSecAttrService,
            service, (id)kSecAttrAccount,
            (id)kSecAttrAccessibleAfterFirstUnlock,(id)kSecAttrAccessible,
            nil];
}

+ (void)save:(NSString *)service data:(id)data {
    //Get search dictionary
    NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
    //Delete old item before add new item
    SecItemDelete((CFDictionaryRef)keychainQuery);
    //Add new object to search dictionary(Attention:the data format)
    [keychainQuery setObject:[NSKeyedArchiver archivedDataWithRootObject:data] forKey:(id)kSecValueData];
    //Add item to keychain with the search dictionary
    SecItemAdd((CFDictionaryRef)keychainQuery, NULL);
}

+ (id)load:(NSString *)service {
    id ret = nil;
    NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
    //Configure the search setting
    //Since in our simple case we are expecting only a single attribute to be returned (the password) we can set the attribute kSecReturnData to kCFBooleanTrue
    [keychainQuery setObject:(id)kCFBooleanTrue forKey:(id)kSecReturnData];
    [keychainQuery setObject:(id)kSecMatchLimitOne forKey:(id)kSecMatchLimit];
    CFDataRef keyData = NULL;
    if (SecItemCopyMatching((CFDictionaryRef)keychainQuery, (CFTypeRef *)&keyData) == noErr) {
        @try {
            ret = [NSKeyedUnarchiver unarchiveObjectWithData:(__bridge NSData *)keyData];
        } @catch (NSException *e) {
            //NSLog(@"Unarchive of %@ failed: %@", service, e);
        } @finally {
        }
    }
    if (keyData)
        CFRelease(keyData);
    return ret;
}

+ (void)delete:(NSString *)service {
    NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
    SecItemDelete((CFDictionaryRef)keychainQuery);
}

+ (NSString *)getUUID{
    NSMutableDictionary *uuidDict = (NSMutableDictionary *)[KeyChain load:KEY_SERVICENAME];
    NSString *uuidStr = uuidDict[KEY_UUID];
    if (uuidStr == nil) {
        NSString *uuid = [[NSUUID UUID]UUIDString];
        NSMutableDictionary *uuidDict = [NSMutableDictionary dictionary];
        [uuidDict setObject:uuid forKey:KEY_UUID];
        [KeyChain save:KEY_SERVICENAME data:uuidDict];
        uuidStr = uuid;
    }

    return uuidStr;
}

+ (NSString *)getUDID{
    NSMutableDictionary *uuidDict = (NSMutableDictionary *)[KeyChain load:KEY_SERVICENAME];
    NSString *udidStr = uuidDict[KEY_UDID];
    return udidStr;
}
@end
